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libdraw: autoscale fonts when moving between low and high dpi screens

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Change-Id: I6093955b222db89dfe437fb723593b173d888d01
Reviewed-on: https://plan9port-review.googlesource.com/1170
Reviewed-by: Russ Cox <rsc@swtch.com>
This commit is contained in:
Russ Cox 2015-02-17 12:16:20 -05:00
parent 77f23268f7
commit 213fc4f6fb
9 changed files with 243 additions and 28 deletions
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15
man/man3/graphics.3
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@ -487,6 +487,21 @@ point to the portion of the window inside the border;
sophisticated clients may use
.B _screen
to make further subwindows.
If
.I getwindow
is being called due to a resizing of the window,
the resize may be accompanied by a change in screen pixel density (DPI),
in which case the value of the
.BR Display 's
.B dpi
field and any open
.BR Font 's
.B height
and
.B ascent
fields may be updated during the call to
.IR getwindow .
Programs should discard any cached information about display or font sizes.
.\" Programs desiring multiple independent windows
.\" may use the mechanisms of
.\" .IR rio (4)